在同一查询中计算 YTD、上一个 YTD

Question

如何在同一个查询中计算 YTD 和之前的 YTD？

我尝试计算重量和年初至今的重量。我不明白如何在同一个查询中添加之前 ytd 的计算。

YTD：从一月一日到今天的权重总和
年初至今：总和去年一月一日到今天的权重减去1年

SELECT SUM(CASE
                   WHEN convert(date,s.Delivery_Year+'-'+ s.Delivery_month+'-'+ s.Delivery_day) BETWEEN dateadd(yy, DATEDIFF(yy, 0, GETDATE()), 0) AND GETDATE() THEN s.Weight
                   ELSE 0
               END) AS WeightYTD ,
           sum(Weight) AS weight ,
           [Sales_Organization] ,
           [Market_Grp] ,
           [Delivery_Year] ,
           [Delivery_month] ,
           Delivery_day
    FROM Fact_sales s
    GROUP BY ,
                      [Sales_Organization] ,
                      [Market_Grp] ,
                      [Delivery_Year] ,
                      [Delivery_month] ,
                      Delivery_day

Answer 1

目前还不清楚 results/behaviour 你到底想要什么。

一种可能的解释是 "year to date" 是相对于 table 中的日期，而不是相对于 "today" / GETDATE().

所以...

对于 14th March 2018 ：年初至今 = 1st Jan 2018 至 14th March 2018
对于 20th March 2019 ：年初至今 = 1st Jan 2019 至 20th March 2019

既然如此，我将执行以下操作以获取 YTD 列...

WITH
    grouped_by_date AS
(
    SELECT
        [Sales_Organization],
        [Market_Grp],
        [Delivery_Year],
        [Delivery_Month],
        [Delivery_Day],
        SUM([Weight])             AS Weight
    FROM
        Fact_sales s
    GROUP BY
        [Sales_Organization],
        [Market_Grp],
        [Delivery_Year],
        [Delivery_Month],
        [Delivery_Day]
),
    cumulative_sum_for_ytd AS
(
    SELECT
        *,
        SUM([Weight]) OVER (PARTITION BY [Delivery_Year]
                                ORDER BY [Delivery_Month], [Delivery_Day]
                           )
                              AS Weight_YTD
    FROM
        grouped_by_date
),

SQL Server 2008 中没有LAG() 功能，但有"hacky tricks" 可以模拟它...

    hack_to_do_lag AS
(
    SELECT
        *,
        CASE
            WHEN [Delivery_Year]%2=1
            THEN MAX(CASE WHEN [Delivery_Year]%2=0 THEN [Weight_YTD] END) OVER (PARTITION BY ([Delivery_Year]+0)/2)
            ELSE MAX(CASE WHEN [Delivery_Year]%2=1 THEN [Weight_YTD] END) OVER (PARTITION BY ([Delivery_Year]+1)/2)
        END
            AS Weight_PreviousYTD
    FROM
        cumulative_sum_for_ytd
)
SELECT
    *
FROM
    hack_to_do_lag

在同一查询中计算 YTD、上一个 YTD

Calculate YTD, Previous YTD in the same query

sql

tsql

sql-server-2008